US9708647B2 - Multiplexed analysis of nucleic acid hybridization thermodynamics using integrated arrays - Google Patents
Multiplexed analysis of nucleic acid hybridization thermodynamics using integrated arrays Download PDFInfo
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- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6813—Hybridisation assays
- C12Q1/6834—Enzymatic or biochemical coupling of nucleic acids to a solid phase
- C12Q1/6837—Enzymatic or biochemical coupling of nucleic acids to a solid phase using probe arrays or probe chips
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- C12Q2527/00—Reactions demanding special reaction conditions
- C12Q2527/107—Temperature of melting, i.e. Tm
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- C12Q2563/00—Nucleic acid detection characterized by the use of physical, structural and functional properties
- C12Q2563/107—Nucleic acid detection characterized by the use of physical, structural and functional properties fluorescence
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- C12Q2565/00—Nucleic acid analysis characterised by mode or means of detection
- C12Q2565/10—Detection mode being characterised by the assay principle
- C12Q2565/101—Interaction between at least two labels
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- C12Q2565/00—Nucleic acid analysis characterised by mode or means of detection
- C12Q2565/60—Detection means characterised by use of a special device
- C12Q2565/607—Detection means characterised by use of a special device being a sensor, e.g. electrode
Definitions
- DNA-DNA hybridization is a molecular biology technique that measures the degree of sequence similarity between deoxyribonucleic acid (DNA) polymers (polynucleotides).
- the underlying principle is that the building blocks of the DNA polymer, i.e., nucleotides, include specific nitrogen-containing nucleobases (guanine “G,” adenine “A,” thymine “T,” and cytosine “C”) capable of pairing up with complementary nucleobases (A with T and C with G) to form hydrogen bonds (two (2) between A-T and three (3) between C-G). Therefore, DNA moieties with complementary sequences have an affinity to bind (hybridize) to one another and DNA dimers (double stranded DNA structures).
- thermodynamics characteristics hybridization depends predominately on the total number, and strength of hydrogen bonds formed between the DNA moieties; a quantity which is a function of multiple parameters such as complementary nucleobase (base) stretches, non-complementary gaps, and the concentration and variety of anions and cations in the environment.
- thermodynamic characteristic of DNA-DNA-hybridization is a powerful tool to infer sequence information regarding the participating moieties.
- the “gold standard” method to extract such information is melt curve analysis (MCA) which detects the dissociation-characteristics of double-stranded and hybridized DNA dimers during a gradual heating process. As temperature is raised, the DNA-DNA complex (assembled through multiple hydrogen bonds) becomes less stable and the strands begin to dissociate.
- MCA melt curve analysis
- SNPs single-nucleotide polymorphisms
- Indels insertions/deletions
- MCA-based methods offer approaches to measure hybridization thermodynamics, they have very limited multiplexing capabilities, i.e., analyzing multiple simultaneously occurring DNA hybridization reactions in a single reaction chamber.
- the measured fluorescent signal is basically the aggregate of all signals originating from individual hybridization events in the reaction chamber, and therefore difficult to decipher when DNA moieties have similar thermodynamic characteristic, or when one moiety has a significantly larger concentration and signal compared to others.
- DNA microarray platforms sometimes referred to as genechips, typically operate based on this principal (Schena M., Shalon D., Davis R. W., Brown P. O. “Quantitative monitoring of gene expression patterns with a complementary DNA microarray,” Science 270 1995(5235): 467-470, and Stoughton RB, “Applications of DNA microarrays in biology,” Annu Rev Biochem. 2005; 74:53-82).
- the advantage of microarrays is that they employ the DNA hybridization thermodynamics to identify sequence, in a massively parallel fashion. However, they lack the specificity of MCA methods.
- microarrays can measure hybridization at a single temperature point, i.e., the temperature in which the sample in incubated on the array for a fixed duration of time, before washing and imaging. While the data from microarrays is still useful to identify SNPs or indels, it is not thorough in terms of thermodynamics. Generally speaking, it is also difficult to design a large number of immobilized probes in for a microarray that can discriminate properly between nucleic acid targets at a single temperature point. This problem becomes particularly challenging when the CG content of the targets has a large variation (>20%) or when targets include highly stable hairpin monomer structure.
- the present disclosure provides methods, devices and systems to measure the thermodynamic characteristics of multiple nucleic acid hybridization reactions that concurrently happen in real time in a single reaction chamber.
- Various embodiments provided herein can be used to create unique nucleic acid detection platform for applications such molecular diagnostics, nucleic acid (e.g., DNA) forensics, and pathogen genotyping, to name a few.
- Further embodiments are provided which can take advantage of semiconductor-integrated biosensor arrays to both miniaturize and integrate the required detection devices.
- An aspect of the present disclosure provides a method for assaying a presence of a target nucleic acid molecule in a sample, comprising (a) providing a chip comprising an integrated sensor adjacent to a sample chamber, wherein the sample chamber is configured to retain the sample having or suspected of having the target nucleic acid molecule, and wherein the integrated sensor (i) has a surface including a probe that selectively couples to the target nucleic molecule, and (ii) detects at least one signal from the sample, which at least one signal is indicative of a presence or absence of the target nucleic acid molecule; (b) providing the sample in the sample chamber under conditions that permit the probe to selectively couple to the target nucleic acid molecule; (c) subjecting the surface to a temperature change while the sample is in the sample chamber; (d) measuring the at least one signal in real-time while subjecting the surface to the temperature change; and (e) generating signal versus temperature data using measurements of the at least one signal with the temperature change.
- the at least one signal includes a plurality of signals.
- the plurality of signals can be at multiple time points and/or multiple temperatures. For example, temperature can be increased at a rate that is a linear or non-linear function of time, and signals can be measured.
- the signal versus temperature data is part of a melt curve.
- the probe is an oligonucleotide.
- the sample is provided in the sample chamber under conditions that permit the oligonucleotide to hybridize to the target nucleic acid molecule.
- a sequence of the target nucleic acid molecule forms a hairpin loop structure when hybridized to the oligonucleotide.
- the integrated sensor is in an array of a plurality of integrated sensors in the chip.
- the array comprises at least about 100 integrated sensors, at least about 500 integrated sensors, at least about 1000 integrated sensors, at least about 2000 integrated sensors, at least about 5000 integrated sensors or at least about 10,000 integrated sensors.
- the at least one signal is selected from the group consisting of an optical signal, electrochemical signal and electrostatic signal.
- the at least one signal is an optical signal that is indicative of an interaction between an energy acceptor and an energy donor pair.
- the energy acceptor quenches optical activity of the energy donor.
- the energy acceptor is coupled to one or more nucleotides of the target nucleic acid molecule.
- the energy acceptor is a quencher. In some embodiments of aspects provided herein, the energy donor is coupled to the probe. In some embodiments of aspects provided herein, the energy donor is a fluorophore. In some embodiments of aspects provided herein, the interaction is not Forster resonance energy transfer (FRET).
- the at least one signal is an optical signal indicative of the activity of an optically-active species. In some embodiments of aspects provided herein, the optically-active species is an intercalator. In some embodiments of aspects provided herein, the optically-active species is a fluorophore. In some embodiments of aspects provided herein, the detecting comprises measuring an increase in the at least one signal relative to background.
- the detecting comprises measuring a decrease in the at least one signal relative to background.
- the integrated sensor further comprises an optical detector, and, in (d), the least one signal is measured with the optical detector.
- the optical detector comprises a complementary metal-oxide semiconductor (CMOS) integrated circuit (IC) device.
- CMOS complementary metal-oxide semiconductor
- the method further comprises, prior to (a), (i) providing a reaction mixture including a biological sample having or suspected of having a template nucleic acid molecule as a precursor of the target nucleic acid molecule, at least one primer that is complementary to the template nucleic acid molecule, and a polymerase, and (ii) subjecting the reaction mixture to a nucleic acid amplification reaction under conditions that yield the target nucleic acid molecule in the sample.
- the at least one primer has a sequence that is selected to identify single nucleotide polymorphism (SNP) in a sequence of the target nucleic acid molecule.
- SNP single nucleotide polymorphism
- the nucleic acid amplification is polymerase chain reaction (PCR). In some embodiments of aspects provided herein, the nucleic acid amplification is asymmetric nucleic acid amplification.
- the chip is electrically coupled to a computer processor that electrically receives the at least one signal from the integrated sensor and determines the presence or absence of the target nucleic acid molecule from the at least one signal. In some embodiments of aspects provided herein, the computer processor generates the signal versus temperature data. In some embodiments of aspects provided herein, the method further comprises outputting the signal versus temperature data on an electronic report.
- the electronic report is outputted on a user interface of an electronic device of a user.
- the surface is subjected to the temperature change at an average rate from about 1° C./min to 20° C./min.
- a temperature controller in thermal communication with the surface subjects the surface to the temperature change.
- the probe is coupled to the surface via a linker.
- the linker comprises a species selected from the group consisting of an amino acid, a polypeptide, a nucleotide and an oligonucleotide.
- the method when the at least one signal is indicative of the presence of the target nucleic acid molecule, the target nucleic acid molecule is detected as a sensitivity of at least about 90%, at least about 95%, at least about 98%, at least about 99%, at least about 99.9% or at least about 99.99%.
- the method further comprises determining a single nucleotide polymorphism (SNP) in a sequence of the target nucleic acid molecule using the signal versus temperature data.
- the method further comprises measuring at least one control signal or a plurality of control signals from an additional integrated sensor.
- the signal versus temperature data is normalized against measurement(s) of the at least one control signal.
- the temperature change is at a linear rate.
- the temperature change is from a first temperature to a second temperature that is greater than the first temperature.
- the at least one signal includes a plurality of signals.
- Another aspect of the present disclosure provides a method for assaying a presence of a target nucleic acid molecule in a sample, comprising (a) subjecting a hybridization array having at least one integrated sensor to a temperature change, (b) measuring signals from the hybridization array with the at least one integrated sensor, and (c) assaying a presence of the target nucleic acid at a sensitivity of at least about 90% by assessing dissociation-characteristics of the target nucleic acid molecule with the temperature change.
- the sensitivity is at least about 95%.
- the hybridization array has a plurality of integrated sensors.
- the at least one integrated sensor is an optical sensor.
- a system for assaying a presence of a target nucleic acid molecule in a sample comprising: a chip comprising an integrated sensor adjacent to a sample chamber, wherein the sample chamber is configured to retain the sample having or suspected of having the target nucleic acid molecule, and wherein the integrated sensor (i) has a surface including a probe that selectively couples to the target nucleic molecule, and (ii) detects at least one signal from the sample, which at least one signal is indicative of a presence or absence of the target nucleic acid molecule; a computer processor coupled to the chip and programmed to (i) subject the surface to a temperature change while the sample is in the sample chamber; (ii) measure the at least one signal while subjecting the surface to the temperature change; and (iii) generate signal versus temperature data using measurements of the at least one signal with the temperature change.
- the at least one signal includes a plurality of signals.
- the plurality of signals can be at multiple time points and/or multiple temperatures. For example, temperature can be increased at a rate that is a linear or non-linear function of time, and signals can be measured.
- the signal versus temperature data is part of a melt curve.
- the integrated sensor is in an array of a plurality of integrated sensors in the chip.
- the array comprises at least about 100 integrated sensors, at least about 500 integrated sensors, at least about 1000 integrated sensors, at least about 2000 integrated sensors, at least about 5000 integrated sensors or at least about 10,000 integrated sensors.
- an individual integrated sensor of the array is individually addressable.
- FIG. 1 shows an exemplary schematic of a multiplex analysis system
- FIG. 2 shows an exemplary schematic of probe and target interaction with energy donors and energy acceptors
- FIG. 3 shows an exemplary schematic of probe and target interaction with intercalators
- FIG. 4 shows an exemplary schematic of probe and target interaction with labeled target
- FIG. 5 shows an exemplary schematic of melt curve analysis
- FIG. 6 shows exemplary images and a schematic of a biosensor array
- FIG. 7 shows an exemplary schematic of biochip array circuitry
- FIG. 8A shows exemplary images of a biochip array
- FIG. 8B shows exemplary graphs of temperature control and melt curve analysis
- FIG. 8C shows exemplary probe and target sequences (SEQ ID NOS 1-4, respectively, in order of appearance);
- FIG. 9 shows an exemplary graph of melt curve analysis and exemplary probe and target sequences (SEQ ID NOS 5-8, respectively, in order of appearance);
- FIG. 10A shows an exemplary graph of melt curve analysis
- FIG. 10B shows exemplary fluorophore-quencher target and probe sequences (SEQ ID NOS 3-4, 9-10, 1-2, and 11-12, respectively, in order of appearance);
- FIG. 11 shows an exemplary schematic of a computer control system that is programmed or otherwise configured to implement methods provided herein.
- probe generally refers to a molecular species or other marker that can bind to a specific target nucleic acid sequence.
- a probe can be any type of molecule or particle. Probes can comprise molecules and can be bound to the substrate or other solid surface, directly or via a linker molecule.
- detector generally refers to a device, generally including optical and/or electronic components that can detect signals.
- mutant generally refers to genetic mutations or sequence variations such as a point mutation, a single nucleotide polymorphism (SNP), an insertion, a deletion, a substitution, a transposition, a translocation, a copy number variation, or another genetic mutation, alteration or sequence variation.
- SNP single nucleotide polymorphism
- label refers to a specific molecular structure that can be attached to a target molecule, to make the target molecule distinguishable and traceable by providing a unique characteristic not intrinsic to the target molecule.
- the present disclosure provides methods, devices, and systems to enable multiplex detection of nucleic acid hybridization reactions, in real time, and as a function temperature.
- the methods, device, and systems of the present disclosure can comprise components including, but not limited to:
- Sample chamber which can include an aqueous environment in which a plurality of free-moving nucleic acid targets, to be analyzed, are present;
- Probe array which can comprise a plurality of nucleic acid probes at independently (or individually) addressable locations on a solid surface.
- the probe array can be interfaced with the sample chamber.
- Each addressable location (herein referred to as a “pixel”) can comprise a plurality of identical nucleic acid sequences (herein referred to as “probes”) that can specifically hybridize to a specific target;
- Temperature controller which can measure and adjust the temperature of the sample chambers to predetermined or specific values between;
- Detector which can measure, in parallel, the signals generated at every pixel. Signals can be related to the molecular labels' presence and activity in their vicinity, as the hybridization events progress as a function of temperature. The signals can be discrete (e.g., individually resolvable) signals.
- the probe array can include independently addressable locations that each has one or a plurality of probes. Probes at a given independently addressable location of the array can be different than probes at other independently addressable locations of the array. In some cases, probes of a group of locations of the array are the same. Probes of the group of locations can be different than probes of all other locations of the array.
- FIG. 1 shows an example of a multiplex analysis system.
- the nucleic acids are in the sample chamber (or reaction chamber), where they can move through diffusion and drift processes to interact with, and if thermodynamically favorable hybridize to, the probes at individual pixels of the addressable array.
- the temperature controller can set the temperature of the reaction chamber to various predefined values to create dissimilar and/or time-varying conditions for the hybridization events.
- the detector can measure the quantity (or magnitude) of hybridization incidents at every pixel, in real time, and as the temperature is varying.
- the acquired data are subsequently used to assess the thermodynamic characteristics of the interaction between the probe nucleic acids and the target nucleic acids.
- Reaction chambers can comprise a closed reservoir.
- the reaction chamber can have a volume from about 10 nanoliters (nL) to 10 milliliters (mL). In some cases, the reaction chamber volume is from about 1 microliter ( ⁇ L) to 100 ⁇ L.
- the reaction chamber volume can be at least about 10 nL, 100 nL, 1 ⁇ L, 10 ⁇ L, 100 ⁇ L, 1 mL, or 10 mL.
- Reaction chambers can contain an aqueous solution.
- the aqueous solution within the reaction chamber can comprise a buffered saline-based solution, such as an aqueous solution comprising a mixture of a weak acid and its conjugate base, or vice versa.
- the solution can comprise a plurality of target nucleic acid sequences, herein referred to as “targets.”
- targets can comprise a plurality of target nucleic acid sequences, herein referred to as “targets.”
- the term “nucleic acid sequence” or “nucleotide sequence” as used in this context refers to nucleic acid molecules with a given sequence of nucleotides, of which it is desired to know the presence or amount.
- the nucleotide sequence can comprise ribonucleic acid (RNA) or DNA, or a sequence derived from RNA or DNA.
- nucleotide sequences are sequences corresponding to natural or synthetic RNA or DNA including genomic DNA and messenger RNA.
- the length of the sequence can be any length that can be amplified into nucleic acid amplification products, or amplicons, for example up to about 20, 50, 100, 200, 300, 400, 500, 600, 700, 800, 1,000, 1,200, 1,500, 2,000, 5,000, 10,000 or more than 10,000 nucleotides in length.
- Acceptors and donors can both be fluorophores molecules. Whether a fluorophore is a donor or an acceptor may be based on its excitation and emission spectra, and the fluorophore with which it is paired.
- Quenchers molecules can be used with method of the present disclosure as acceptors of a dual reporter structure.
- Example quenchers include Black Hole Quencher Dyes (Biosearch Technologies such as BHQ-0, BHQ-1, BHQ-2, BHQ-3, BHQ-10; QSY Dye fluorescent quenchers (from Molecular Probes/Invitrogen) such as QSY7, QSY9, QSY21, QSY35, and other quenchers such as Dabcyl and Dabsyl; Cy5Q and Cy7Q and Dark Cyanine dyes (GE Healthcare).
- Black Hole Quencher Dyes Biosearch Technologies such as BHQ-0, BHQ-1, BHQ-2, BHQ-3, BHQ-10
- QSY Dye fluorescent quenchers from Molecular Probes/Invitrogen
- QSY7, QSY9, QSY21, QSY35 and other quenchers such as Dabcyl and Dabsyl
- Optical labels can also be nucleic acid intercalators dyes, herein referred to as intercalators.
- intercalators examples include, but are not limited to, ethidium bromide, YOYO-1, SYBR Green, and EvaGreen.
- the near-field interactions between energy donors and energy acceptors, between intercalators and energy donors, or between intercalators and energy acceptors can result in the generation of unique signals or a change in the signal amplitude. For instance, such interactions can result in quenching (i.e., energy transfer from donor to acceptor that results in non-radiative energy decay) or Forster resonance energy transfer (FRET) (i.e., energy transfer from the donor to an acceptor that results in radiative energy decay).
- quenching i.e., energy transfer from donor to acceptor that results in non-radiative energy decay
- FRET Forster resonance energy transfer
- labels include electrochemical labels, electrostatic labels, colorimetric labels and mass tags. Such labels may be used with devices, methods and systems of the present disclosure.
- Labels can be coupled to a target molecule by direct attachment or by attachment through one or more linkers (e.g., linker molecules). In some cases, labels couple to a target molecule by an electrostatic interaction that may not involve forming a covalent bond with the target molecule.
- linkers e.g., linker molecules
- Amplification can be isothermal, with chemistries including but not limited to loop-mediated isothermal amplification (LAMP), strand displacement amplification (SDA), helicase-dependent amplification (HDA), and nicking enzyme amplification reaction (NEAR).
- LAMP loop-mediated isothermal amplification
- SDA strand displacement amplification
- HDA helicase-dependent amplification
- NEAR nicking enzyme amplification reaction
- Methods of attaching and/or conjugating such labels include, without limitation, ligation, biotin-streptavidin conjugation, hydrazone bonds, reaction of amine-reactive labels with aminoallyl dUTP, and T4 polynucleotide kinase (PNK).
- amplification can be performed by PCR.
- PCR can rely on thermal cycling, including one or more cycles of repeated heating and cooling of the reaction for polynucleotide melting and enzymatic replication of the polynucleotide.
- Primers short nucleic acid fragments containing sequences complementary to a target region of a target polynucleotide along with polymerizing enzyme (e.g., DNA or RNA polymerase), can provide for the selective and repeated amplification of the target polynucleotide.
- the primers can have sequences that are complementary to a sequence of interest, such as a sequence with a mutation or a sequence that has been identified to predispose a subject to a given disease (e.g., cancer).
- the polynucleotide generated can itself used as a template for replication, setting in motion a chain reaction in which the target polynucleotide template is exponentially amplified.
- amplification can be asymmetric PCR, which can preferentially amplify one polynucleotide strand in a double-stranded polynucleotide template. This approach can be where amplification of only one of two complementary strands is required.
- asymmetric PCR PCR is carried out as described above, but with an excess of a primer having sequence complementarity to the strand targeted for amplification. Because of the slow (arithmetic) amplification later in the reaction after the limiting primer has been exhausted, extra cycles of PCR may be required.
- asymmetric amplification may use a limiting primer with a higher melting temperature (Tm) than an excess primer to maintain reaction efficiency as the limiting primer concentration decreases mid-reaction.
- Tm melting temperature
- Amplification can be isothermal amplification.
- An example of an isothermal amplification method is strand displacement amplification, also referred to as SDA, which may use cycles of annealing pairs of primer sequences to opposite strands of a target sequence, primer extension in the presence of a dNTP to produce a duplex hemiphosphorothioated primer extension product, endonuclease-mediated nicking of a hemimodified restriction endonuclease recognition site, and polymerase-mediated primer extension from the 3′ end of the nick to displace an existing strand and produce a strand for the next round of primer annealing, nicking and strand displacement, resulting in geometric amplification of product.
- SDA strand displacement amplification
- thermophilic SDA may use thermophilic endonucleases and polymerases at higher temperatures in essentially the same method. See, e.g., European Pat. No. 0 684 315, which is entirely incorporated herein by reference.
- isothermal nucleic acid amplification include the use of primers containing non-canonical nucleotides (e.g., uracil or RNA nucleotides) in combination with an enzyme that cleaves nucleic acids at the non-canonical nucleotides (e.g., DNA glycosylase or RNaseH) to expose binding sites for additional primers (e.g., U.S. Pat. No. 6,251,639, U.S. Pat. No. 6,946,251, and U.S. Pat. No. 7,824,890), which are hereby incorporated by reference in their entirety.
- Isothermal amplification processes can be linear or exponential.
- a probe can comprise biological materials deposited so as to create spotted arrays.
- a probe can comprise materials synthesized, deposited, or positioned to form arrays according to other technologies.
- microarrays formed in accordance with any of these technologies may be referred to generally and collectively hereafter for convenience as “probe arrays.”
- the term “probe” is not limited to probes immobilized in array format. Rather, the functions and methods described herein can also be employed with respect to other parallel assay devices. For example, these functions and methods may be applied with respect to probe-set identifiers that can identify probes immobilized on or in beads, optical fibers, or other substrates or media. The construction of various probe arrays is described in more detail herein.
- polynucleotide can include polydeoxyribonucleotides (containing 2-deoxy-D-ribose), polyribonucleotides (containing D-ribose), any other type of polynucleotide which is an N- or C-glycoside of a purine or pyrimidine base, and other polymers containing nonnucleotidic backbones.
- Nucleic acids can comprise phosphodiester bonds (i.e., natural nucleic acids), Nucleic acids can comprise nucleic acid analogs that may have alternate backbones, comprising, for example, phosphoramide (see, e.g., Beaucage et al., Tetrahedron 49(10):1925 (1993) and U.S. Pat. No. 5,644,048), phosphorodithioate (see, e.g., Briu et al., J. Am. Chem. Soc.
- Nucleic acids can comprise other analog nucleic acids including those with positive backbones (see, e.g., Denpcy et al., Proc. Natl. Acad. Sci. USA 92:6097 (1995); non-ionic backbones (see, e.g., U.S. Pat. Nos.
- the solid substrate can be biological, non-biological, organic, inorganic, or a combination of any of these.
- the substrate can exist as one or more particles, strands, precipitates, gels, sheets, tubing, spheres, containers, capillaries, pads, slices, films, plates, slides, or semiconductor integrated chips, for example.
- the solid substrate is can be flat or can take on alternative surface configurations.
- the solid substrate can contain raised or depressed regions on which synthesis or deposition takes place.
- the solid substrate can be chosen to provide appropriate light-absorbing characteristics.
- the substrate can be a polymerized Langmuir Blodgett film, functionalized glass, Si, Ge, GaAs, GaP, SiO 2 , SiN 4 , modified silicon, the top dielectric layer of a semiconductor integrated circuit (IC) chip, or any one of a variety of gels or polymers such as (poly)tetrafluoroethylene, (poly)vinylidenedifluoride, polystyrene, polycarbonate, or combinations thereof.
- IC semiconductor integrated circuit
- the plurality of probes can be located in one or more addressable regions on a solid substrate, herein referred to as “pixels.”
- a solid substrate comprises at least about 2, 3, 4, 5, 6, or 7-10, 10-50, 50-100, 100-500, 500-1,000, 1,000-5,000, 5,000-10,000, 10,000-50,000, 50,000-100,000, 100,000-500,000, 500,000-1,000,000 or over 1,000,000 pixels with probes.
- a solid substrate comprises at most about 2, 3, 4, 5, 6, or 7-10, 10-50, 50-100, 100-500, 500-1,000, 1,000-5,000, 5,000-10,000, 10,000-50,000, 50,000-100,000, 100,000-500,000, 500,000-1,000,000 or over 1,000,000 pixels with probes.
- a solid substrate comprises about 2, 3, 4, 5, 6, or 7-10, 10-50, 50-100, 100-500, 500-1,000, 1,000-5,000, 5,000-10,000, 10,000-50,000, 50,000-100,000, 100,000-500,000, 500,000-1,000,000 or over 1,000,000 pixels with probes.
- pixels which do not contain probes can act as control spots in order to increase the quality of the measurement, for example, by using binding to the spot to estimate and correct for non-specific binding.
- the data acquired by such probe arrays may be less susceptible to fabrication non-idealities and measurement errors.
- labels are attached to the probes within the pixels, in addition to the labels that are incorporated into the targets.
- captured targets can result in two labels coming into intimate proximity with each other in the pixel.
- interactions between specific labels can create unique detectable signals.
- the labels on the target and probe, respectively are fluorescent donor and acceptor moieties that can participate in a fluorescent resonance energy transfer (FRET) phenomenon, FRET signal enhancement or signal quenching can be detected.
- FRET fluorescent resonance energy transfer
- a temperature controller can establish a specific temperature for the solution in the reaction chamber, and/or create a temperature profile that requires heating and/or cooling.
- a temperature controller can include a feedback control system that measures the temperature, using temperature sensors (such as a thermistor or a thermocouple), and, based on the measured temperature, add or remove heat from the reaction chamber using thermal devices (such as Peltier devices or resistive heaters).
- Temperature controllers can comprise heat sinks for removing heat. Temperature controllers can be integrated into an array. The temperature of an array can be controlled by individual pixel, by array regions or sub-regions, or on an array-wide scale.
- the rate of temperature change can be at most about 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20° C./minute.
- Temperature controllers can change temperature at a linear rate (e.g., 5° C./second). Alternatively, temperature controllers can change temperature at a non-linear rate. Temperature controllers can increase or decrease temperature.
- detectors that may be used to detect signals.
- signals can be used for nucleic acid hybridization thermodynamics, such as melt curve analysis.
- detectors can be optical detectors for measuring optical signals, electrochemical detectors for measuring electrochemical signals, or electrostatic detectors for measuring charge.
- Signals detected by a detector can include signals conveying information about the presence, absence, and/or quantity of the labels, including the level of activity of labels at all pixels in real time and during the amplification process.
- Signals can be optical, such as fluorescence or chemi-luminescence.
- Signals can be electrical, such as electrochemical signals, electrostatic signals, resistance, capacitance, or inductance.
- Signals can be processed, including normalization to a background signal. Signals can be detected in real-time.
- the detector can sample (e.g., acquire measurements) at a rate of at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 90, 120, 150, 180, 210, 240, 270, 300, 400, 500, 1000, 10,000 times per minute.
- the detector can comprise a light source.
- the light source can be used, for example, to excite fluorescence and/or colorimetric labels.
- the light source can comprise at least one lamp, such as an incandescent, halogen, fluorescent, gas-discharge, arc, or light emitting diode (LED).
- the light source can comprise a laser.
- the light source can produce a specific wavelength or range or wavelengths, such as UV.
- the light source can comprise filters for controlling the output spectrum, wavelength, or wavelengths.
- the light source can comprise multiple light sources, of the same or of different types, which can be used separately or in combination.
- the detector can measure emitted photons coming from individual pixels. These photons can be correlated to the presence and/or activity of optical labels in that area.
- the detector comprises an integrated biosensor array, which may be built using CMOS integrated circuit (IC) fabrication processes (Plummer J. D. et al., “Silicon Technologies: Fundamentals, Practice, and Modeling,” Prentice Hall Electronics and VLSI Series, 2000).
- CMOS biochips the probe array can be placed on top of a CMOS biochip. Examples of such systems may be found in, for example, U.S. Patent Pub. Nos.
- Method B shown in FIG. 2 , the hybridization of the target to the probe involves a hairpin loop forming in the target which specifically places the donor and acceptor in intimate proximity. This is done to ensure efficient interaction between the donor and acceptor and can be achieved by having the 3′-end of the probe sequence partially matching the 5′-end of the target, where the acceptor label resides. In either of these cases, the reduction in donor signal resulting when the target hybridizes to the probe can be detected and correlated to the hybridization reaction the probe and target.
- the acceptor can be a non-radiative label, such as a quencher molecule.
- FIG. 3 shows a nucleic acid target and a probe interacting with an intercalator while an optical excitation source with wavelengths specific to the intercalator excitation (absorption) spectrum is present.
- Method A shown in FIG. 3 , the intercalator molecules, which are present and free roaming, in the reaction chamber, are inactive when in the presence of the probe with unbound target; once the target hybridizes to the probe, the intercalator within the hybridized complex become activated and radiate a signal matching the emission spectrum of the intercalator indicating hybridization at that pixel.
- Method B shown in FIG.
- the probe is labeled with an energy acceptor capable of accepting energy from the intercalator; once the target hybridizes the probe, energy from the activated intercalator is harvested by the energy acceptor.
- the acceptor is fluorophore
- the radiated signal indicates hybridization (Howell, W M, Jobs, M, and Brooks, A J, “iFRET: an improved fluorescence system for DNA-melting analysis,” Genome Res. 2002 September; 12(9):1401-7).
- the increased signal from intercalator or acceptor fluorophore, respectively
- the target attachment to the probe is detected and correlated to the hybridization between the probe and target at specific temperatures.
- the nucleic acid target can be labeled by multiple acceptors.
- a target can be, for example, one or more amplicons of a PCR reaction in which acceptor-modified dNTPs are used.
- FIG. 4 shows a probe labeled a donor and a target with multiple energy acceptor labels.
- the probe label Prior to target hybridization, the probe label is radiating signal in presence of an optical excitation source with wavelengths matching the excitation (absorption) spectrum of the donor.
- the energy acceptors on the target can accept energy from the energy donor, effectively deactivating the donor and quenching its signal.
- the reduction in energy donor signal resulting when the probe binds to the target can be detected and correlated to the hybridization between the probe and target at that temperature.
- the acceptor can be a non-radiative label, such as a quencher molecule.
- nucleic acid targets can comprise differences in sequence (e.g., SNPs), which can affect the binding between a target and a given probe. These differences can be observed as differences in the melt curve at different pixels or at a single pixel at different experiments.
- two nucleic acid targets can differ in length, such as from an insertion or deletion (indel) or varying number of sequence repeats. This length difference can be detected through MCA, for example by varying length between a label and a probe binding target sequence location in the target nucleic acid.
- FIG. 5 shows an example of how MCA may be performed in parallel using methods of the present disclosure, such as use of end-labeled targets with donor probes.
- signals from three pixels are shown. Two of these pixels include probes that have matching targets (Target 1 and Target 2) in the reaction chamber with dissimilar matching sequences, while the third pixel include a probe that is designed specifically to not to hybridize to any sequence within the sample.
- the signals generated from these pixels are, Signal 1, Signal 2, and Control, respectively.
- the raw signals show a non-monotonic increase in Signal 1 and Signal 2 yet with a different profile.
- Methods of the present disclosure can be implemented using integrated detectors.
- An example advantage of using integrated biosensors, rather than conventional detection apparatuses, is the drastic reduction is size and lower cost.
- integrated biosensor arrays can be manufactured using semiconductor integrated circuit (IC) micro-fabrication processes, e.g., complementary metal-oxide-semiconductor (CMOS), which can offer unmatched reliability, high-volume manufacturing, and reliability. Examples of sensors that may be used with integrated biosensors arrays of the present disclosure are provided in U.S. Patent Pub. Nos.
- each sensor element can be addressable and can include its own probe.
- Such sensor element may be a biosensor.
- the array can comprise a number of individual biosensors, such as at least about 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000, 15000, 20000, 25000, 30000, 35000, 40000, 45000, 50000, 55000, 60000, 65000, 70000, 75000, 80000, 85000, 90000, 95000, or 100000 integrated biosensors.
- the density of individual biosensor in the array can be at least about 100, 200, 300, 400, 500, 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000 biosensor pixels per mm 2 .
- FIG. 6 shows an optical CMOS integrated biosensor detector ( FIG. 6 , top left) comprising a 32 by 32 array of optical biosensors ( FIG. 6 , top right).
- Each optical biosensor occupies an area of 100 ⁇ m ⁇ 100 ⁇ m.
- the optical biosensor array has a total area of 3.2 mm ⁇ 3.2 mm.
- Each biosensor comprises an integrated CMOS photodiode sensor, and an emission filter is located between the CMOS integrated sensors and the reaction chamber of the associated array pixel ( FIG. 6 , bottom left).
- the heat of the array can be controlled by heaters ( FIG. 6 , bottom right).
- FIG. 11 shows a computer system 1101 that is programmed or otherwise configured to conduct chemical analysis, such as melt curve analysis.
- the computer system 1101 can regulate various aspects of chemical analysis (e.g., melt curve analysis) of the present disclosure, such as, for example, temperature, reagent handling, and detection.
- the computer system 1101 can be an electronic device of a user or a computer system that is remotely located with respect to the electronic device.
- the electronic device can be a mobile electronic device.
- the computer system 1101 includes a central processing unit (CPU, also “processor” and “computer processor” herein) 1105 , which can be a single core or multi core processor, or a plurality of processors for parallel processing.
- the computer system 1101 also includes memory or memory location 1110 (e.g., random-access memory, read-only memory, flash memory), electronic storage unit 1115 (e.g., hard disk), communication interface 1120 (e.g., network adapter) for communicating with one or more other systems, and peripheral devices 1125 , such as cache, other memory, data storage and/or electronic display adapters.
- the memory 1110 , storage unit 1115 , interface 1120 and peripheral devices 1125 are in communication with the CPU 1105 through a communication bus (solid lines), such as a motherboard.
- the storage unit 1115 can be a data storage unit (or data repository) for storing data.
- the computer system 1101 can be operatively coupled to a computer network (“network”) 1130 with the aid of the communication interface 1120 .
- the network 1130 can be the Internet, an internet and/or extranet, or an intranet and/or extranet that is in communication with the Internet.
- the network 1130 in some cases is a telecommunication and/or data network.
- the network 1130 can include one or more computer servers, which can enable distributed computing, such as cloud computing.
- the network 1130 in some cases with the aid of the computer system 1101 , can implement a peer-to-peer network, which may enable devices coupled to the computer system 1101 to behave as a client or a server.
- the CPU 1105 can execute a sequence of machine-readable instructions, which can be embodied in a program or software.
- the instructions may be stored in a memory location, such as the memory 1110 .
- the instructions can be directed to the CPU 1105 , which can subsequently program or otherwise configure the CPU 1105 to implement methods of the present disclosure. Examples of operations performed by the CPU 1105 can include fetch, decode, execute, and writeback.
- the CPU 1105 can be part of a circuit, such as an integrated circuit.
- a circuit such as an integrated circuit.
- One or more other components of the system 1101 can be included in the circuit.
- the circuit is an application specific integrated circuit (ASIC).
- Methods as described herein can be implemented by way of machine (e.g., computer processor) executable code stored on an electronic storage location of the computer system 1101 , such as, for example, on the memory 1110 or electronic storage unit 1115 .
- the machine executable or machine readable code can be provided in the form of software.
- the code can be executed by the processor 1105 .
- the code can be retrieved from the storage unit 1115 and stored on the memory 1110 for ready access by the processor 1105 .
- the electronic storage unit 1115 can be precluded, and machine-executable instructions are stored on memory 1110 .
- the code can be pre-compiled and configured for use with a machine have a processor adapted to execute the code, or can be compiled during runtime.
- the code can be supplied in a programming language that can be selected to enable the code to execute in a pre-compiled or as-compiled fashion.
- aspects of the systems and methods provided herein can be embodied in programming.
- Various aspects of the technology may be thought of as “products” or “articles of manufacture” typically in the form of machine (or processor) executable code and/or associated data that is carried on or embodied in a type of machine readable medium.
- Machine-executable code can be stored on an electronic storage unit, such memory (e.g., read-only memory, random-access memory, flash memory) or a hard disk.
- “Storage” type media can include any or all of the tangible memory of the computers, processors or the like, or associated modules thereof, such as various semiconductor memories, tape drives, disk drives and the like, which may provide non-transitory storage at any time for the software programming.
- All or portions of the software may at times be communicated through the Internet or various other telecommunication networks. Such communications, for example, may enable loading of the software from one computer or processor into another, for example, from a management server or host computer into the computer platform of an application server.
- another type of media that may bear the software elements includes optical, electrical and electromagnetic waves, such as used across physical interfaces between local devices, through wired and optical landline networks and over various air-links.
- the physical elements that carry such waves, such as wired or wireless links, optical links or the like, also may be considered as media bearing the software.
- terms such as computer or machine “readable medium” refer to any medium that participates in providing instructions to a processor for execution.
- a machine readable medium such as computer-executable code
- a tangible storage medium such as computer-executable code
- Non-volatile storage media include, for example, optical or magnetic disks, such as any of the storage devices in any computer(s) or the like, such as may be used to implement the databases, etc. shown in the drawings.
- Volatile storage media include dynamic memory, such as main memory of such a computer platform.
- Tangible transmission media include coaxial cables; copper wire and fiber optics, including the wires that comprise a bus within a computer system.
- Carrier-wave transmission media may take the form of electric or electromagnetic signals, or acoustic or light waves such as those generated during radio frequency (RF) and infrared (IR) data communications.
- RF radio frequency
- IR infrared
- Common forms of computer-readable media therefore include for example: a floppy disk, a flexible disk, hard disk, magnetic tape, any other magnetic medium, a CD-ROM, DVD or DVD-ROM, any other optical medium, punch cards paper tape, any other physical storage medium with patterns of holes, a RAM, a ROM, a PROM and EPROM, a FLASH-EPROM, any other memory chip or cartridge, a carrier wave transporting data or instructions, cables or links transporting such a carrier wave, or any other medium from which a computer may read programming code and/or data.
- Many of these forms of computer readable media may be involved in carrying one or more sequences of one or more instructions to a processor for execution.
- the computer system 1101 can include or be in communication with an electronic display 1135 that comprises a user interface (UI) 1140 for providing, for example, temperature values, temperature control, detector data, and fluid handling.
- UI user interface
- Examples of UI's include, without limitation, a graphical user interface (GUI) and web-based user interface.
- Methods and systems of the present disclosure can be implemented by way of one or more algorithms.
- An algorithm can be implemented by way of software upon execution by the central processing unit 1105 .
- the algorithm can, for example, control the temperature of array pixels and collect and process data.
- MCA Melt Curve Analysis
- An array of probes is contacted with first targets and second targets, and binding occurs between the probes and the targets (see, e.g., FIG. 8 ).
- the integrated biosensor array blocks the excitation signal and collect the emission signals from the array, and melt curves are produced for the first targets (Signal (1)) and the second targets (Signal (2)) with normalized signal compared to temperature ( FIG. 8B , lower graph). Probe and target sequences used are shown in FIG. 8C .
- the donor label in this experiment is HEX and the acceptor (quencher) is Iowa Black.
- MCA Intercalator-Based Melt Curve Analysis
- An array of probes is contacted with first targets and second targets, and binding occurs between the probes and the targets in the presence of SYBR Green intercalator (see, e.g., FIG. 9 , right-hand side).
- the intercalator In the absence of binding between the probe and the target, the intercalator is not active; when the probe and target bind, the intercalator activates and radiates signal.
- the temperature is increased using on-chip heaters over time.
- the integrated biosensor array blocks the excitation signal and collect the emission collect emission signals from the array, and melt curves are produced for the first targets (Signal (1)) and the second targets (Signal (2)) with normalized signal compared to temperature ( FIG. 9 , graph). Probe and target sequences used are shown in FIG. 9 , lower portion.
- MCA Fluorophore-Quencher-Based Melt Curve Analysis
- An array of first, second, third, and fourth probes is contacted with first, second, third, fourth targets, and binding occurs between the probes and the targets (see, e.g., FIG. 10A , right-hand side).
- the probes are end-labeled with energy donors, and the targets are end-labeled with energy acceptors.
- the temperature is increased over time.
- the biochip sensors collect signal from the array, and melt curves are produced for the first targets (Signal 1), the second targets (Signal 2), the third targets (Signal 3), and the fourth targets (Signal 4) with normalized signal compared to temperature ( FIG. 10A , graph). Probe and target sequences used are shown in FIG. 10B .
- the donor label in this experiment is HEX and the acceptor (quencher) is Iowa Black.
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